Infiniti G20 (P11). Manual — part 1

AUTOMATIC TRANSAXLE

SECTION

AT

CONTENTS

TROUBLE DIAGNOSIS - INDEX . . . . . . . . . 4

Alphabetical & P No. Index for DTC . . . . . . ...4

PRECAUTIONS . . . . . . . . . . . . . . . ...6

Supplemental Restraint System (SRS)

″

AIR

BAG

″

and

″

SEAT BELT PRE-TENSIONER

″

. . . ...6

Precautions for On Board Diagnostic (OBD)
System of A/T and Engine. . . . . . . . . . ...6
Precautions . . . . . . . . . . . . . . . . ..6
Service Notice or Precautions . . . . . . . . . .8
Wiring Diagrams and Trouble Diagnosis. . . . . .9

PREPARATION . . . . . . . . . . . . . . . .10

Special Service Tools . . . . . . . . . . . . 10
Commercial Service Tools . . . . . . . . . . .12

OVERALL SYSTEM . . . . . . . . . . . . . ..14

A/T Electrical Parts Location . . . . . . . . . .14
Circuit Diagram . . . . . . . . . . . . . . ..15
Cross-sectional View - RE4F03B . . . . . . . ..16
Cross-sectional View - RE4F03W . . . . . . . .17
Hydraulic Control Circuit. . . . . . . . . . . 18
Shift Mechanism . . . . . . . . . . . . . . 19
Control System . . . . . . . . . . . . . . ..28
Control Mechanism. . . . . . . . . . . . . 29
Control Valve . . . . . . . . . . . . . . . .34

ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION . . . . . . . . . . . . . . . ...36

Introduction . . . . . . . . . . . . . . . . 36
OBD-II Function for A/T System. . . . . . . . 36
One or Two Trip Detection Logic of OBD-II . . . ..36
OBD-II Diagnostic Trouble Code (DTC) . . . . . 36
Malfunction Indicator Lamp (MIL). . . . . . . ..40
CONSULT-II . . . . . . . . . . . . . . . ...40

TROUBLE DIAGNOSIS - INTRODUCTION. . . . ..56

Introduction . . . . . . . . . . . . . . . . 56
Work Flow. . . . . . . . . . . . . . . . ..60

TROUBLE DIAGNOSIS - BASIC INSPECTION . . ...62

A/T Fluid Check . . . . . . . . . . . . . . .62
Stall Test . . . . . . . . . . . . . . . . . 62
Line Pressure Test. . . . . . . . . . . . . .66
Road Test. . . . . . . . . . . . . . . . ...67

TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION . . . . . . . . . . . . . . . ...86

Symptom Chart. . . . . . . . . . . . . . ..86
TCM Terminals and Reference Value. . . . . . 99

TROUBLE DIAGNOSIS FOR POWER SUPPLY. . 104

Wiring Diagram - AT - MAIN. . . . . . . . . 104
Diagnostic Procedure . . . . . . . . . . . ..105

DTC P0705 PARK/NEUTRAL POSITION (PNP)
SWITCH . . . . . . . . . . . . . . . . . ...107

Description . . . . . . . . . . . . . . . ...107
Wiring Diagram - AT - PNP/SW. . . . . . . ...109
Diagnostic Procedure . . . . . . . . . . . .. 110
Component Inspection. . . . . . . . . . . . 112

DTC P0710 A/T FLUID TEMPERATURE SENSOR
CIRCUIT . . . . . . . . . . . . . . . . . ... 113

Description . . . . . . . . . . . . . . . ... 113
Wiring Diagram - AT - FTS . . . . . . . . . .. 115
Diagnostic Procedure . . . . . . . . . . . .. 116
Component Inspection. . . . . . . . . . . . 118

DTC P0720 VEHICLE SPEED SENSOR.A/T
(REVOLUTION SENSOR) . . . . . . . . . . ... 119

Description . . . . . . . . . . . . . . . ... 119
Wiring Diagram - AT - VSSA/T . . . . . . . . 121
Diagnostic Procedure . . . . . . . . . . . ..122

DTC P0725 ENGINE SPEED SIGNAL . . . . . ...124

Description . . . . . . . . . . . . . . . ...124
Wiring Diagram - AT - ENGSS . . . . . . . . 125
Diagnostic Procedure . . . . . . . . . . . ..126

DTC P0731 A/T 1ST GEAR FUNCTION . . . . . 128

Description . . . . . . . . . . . . . . . ...128
Wiring Diagram - AT - 1ST . . . . . . . . . ..131
Diagnostic Procedure . . . . . . . . . . . ..132
Component Inspection. . . . . . . . . . . .133

DTC P0732 A/T 2ND GEAR FUNCTION . . . . . 135

Description . . . . . . . . . . . . . . . ...135
Wiring Diagram - AT - 2ND. . . . . . . . . ..138
Diagnostic Procedure . . . . . . . . . . . ..139
Component Inspection. . . . . . . . . . . .140

DTC P0733 A/T 3RD GEAR FUNCTION . . . . . 141

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Description . . . . . . . . . . . . . . . ...141
Wiring Diagram - AT - 3RD. . . . . . . . . ..144
Diagnostic Procedure . . . . . . . . . . . ..145
Component Inspection. . . . . . . . . . . .146

DTC P0734 A/T 4TH GEAR FUNCTION . . . . . 147

Description . . . . . . . . . . . . . . . ...147
Wiring Diagram - AT - 4TH . . . . . . . . . ..151
Diagnostic Procedure . . . . . . . . . . . ..152
Component Inspection. . . . . . . . . . . .156

DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE. . . . . . . . . . . . . ..157

Description . . . . . . . . . . . . . . . ...157
Wiring Diagram - AT - TCV. . . . . . . . . ..159
Diagnostic Procedure . . . . . . . . . . . ..160
Component Inspection. . . . . . . . . . . .162

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP) . 163

Description . . . . . . . . . . . . . . . ...163
Wiring Diagram - AT - TCCSIG . . . . . . . ...166
Diagnostic Procedure . . . . . . . . . . . ..167
Component Inspection. . . . . . . . . . . .173

DTC P0745 LINE PRESSURE SOLENOID VALVE ...174

Description . . . . . . . . . . . . . . . ...174
Wiring Diagram - AT - LPSV. . . . . . . . . 176
Diagnostic Procedure . . . . . . . . . . . ..177
Component Inspection. . . . . . . . . . . .180

DTC P0750 SHIFT SOLENOID VALVE A . . . . ..181

Description . . . . . . . . . . . . . . . ...181
Wiring Diagram - AT - SSV/A . . . . . . . . ..183
Diagnostic Procedure . . . . . . . . . . . ..184
Component Inspection. . . . . . . . . . . .186

DTC P0755 SHIFT SOLENOID VALVE B . . . . ..187

Description . . . . . . . . . . . . . . . ...187
Wiring Diagram - AT - SSV/B . . . . . . . . ..189
Diagnostic Procedure . . . . . . . . . . . ..190
Component Inspection. . . . . . . . . . . .192

DTC P1705 THROTTLE POSITION SENSOR . . ...193

Description . . . . . . . . . . . . . . . ...193
Wiring Diagram - AT - TPS. . . . . . . . . ..196
Diagnostic Procedure . . . . . . . . . . . ..197
Component Inspection. . . . . . . . . . . .201

DTC P1760 OVERRUN CLUTCH SOLENOID
VALVE. . . . . . . . . . . . . . . . . . ..202

Description . . . . . . . . . . . . . . . ...202
Wiring Diagram - AT - OVRCSV. . . . . . . ..204
Diagnostic Procedure . . . . . . . . . . . ..205
Component Inspection. . . . . . . . . . . .207

DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP
SENSOR CIRCUIT AND TCM POWER SOURCE) . 208

Description . . . . . . . . . . . . . . . ...208
Wiring Diagram - AT - BA/FTS . . . . . . . . 210
Diagnostic Procedure . . . . . . . . . . . .. 211
Component Inspection. . . . . . . . . . . .214

DTC VHCL SPEED SEN.MTR VEHICLE SPEED
SENSOR.MTR. . . . . . . . . . . . . . . ..215

Description . . . . . . . . . . . . . . . ...215
Wiring Diagram - AT - VSSMTR. . . . . . . ..217
Diagnostic Procedure . . . . . . . . . . . ..218

DTC CONTROL UNIT (RAM), CONTROL UNIT
(ROM). . . . . . . . . . . . . . . . . . ...219

Description . . . . . . . . . . . . . . . ...219
Diagnostic Procedure . . . . . . . . . . . ..219

DTC CONTROL UNIT (EEP ROM) . . . . . . . .221

Description . . . . . . . . . . . . . . . ...221
Diagnostic Procedure . . . . . . . . . . . ..222

TROUBLE DIAGNOSES FOR SYMPTOMS . . . ...223

Wiring Diagram - AT - NONDTC . . . . . . . .223
1. O/D OFF Indicator Lamp Does Not Come On. 225
2. Engine Cannot Be Started In

″

P

″

and

″

N

″

Position . . . . . . . . . . . . . . . . . 228
3. In

″

P

″

Position, Vehicle Moves Forward Or

Backward When Pushed . . . . . . . . . . .229
4. In

″

N

″

Position, Vehicle Moves . . . . . . ...230

5. Large Shock.

″

N

″

->

″

R

″

Position . . . . . ...232

6. Vehicle Does Not Creep Backward In

″

R

″

Position . . . . . . . . . . . . . . . . . 234
7. Vehicle Does Not Creep Forward In

″

D

″

,

″

2

″

Or

″

1

″

Position. . . . . . . . . . . . . . .237

8. Vehicle Cannot Be Started From D

1

. . . . ...240

9. A/T Does Not Shift: D

1

-> D

2

Or Does Not

Kickdown: D

4

-> D

2

. . . . . . . . . . . . ..243

10. A/T Does Not Shift: D

2

-> D

3

. . . . . . . .246

11. A/T Does Not Shift: D

3

-> D

4

. . . . . . . .249

12. A/T Does Not Perform Lock-up . . . . . . .252
13. A/T Does Not Hold Lock-up Condition . . . ..254
14. Lock-up Is Not Released. . . . . . . . ...256
15. Engine Speed Does Not Return To Idle (Light
Braking D

4

-> D

3

). . . . . . . . . . . . . .257

16. Vehicle Does Not Start From D

1

. . . . . ...259

17. A/T Does Not Shift: D

4

-> D

3

, When

Overdrive Control Switch

″

ON

″

->

″

OFF

″

. . . ...260

18. A/T Does Not Shift: D

3

-> 2

2

, When Selector

Lever

″

D

″

->

″

2

″

Position. . . . . . . . . . .261

19. A/T Does Not Shift: 2

2

-> 1

1

, When Selector

Lever

″

2

″

->

″

1

″

Position . . . . . . . . . . .262

20. Vehicle Does Not Decelerate By Engine
Brake. . . . . . . . . . . . . . . . . . 263
21. TCM Self-diagnosis Does Not Activate (PNP,
Overdrive Control and Throttle Position Switches
Circuit Checks) . . . . . . . . . . . . . . 263

A/T SHIFT LOCK SYSTEM. . . . . . . . . . .272

Description . . . . . . . . . . . . . . . ...272
Shift Lock System Electrical Parts Location. . . 272
Wiring Diagram - SHIFT -. . . . . . . . . . 273
Diagnostic Procedure . . . . . . . . . . . ..274

CONTENTS

(Cont’d)

AT-2

KEY INTERLOCK CABLE . . . . . . . . . . ..278

Components. . . . . . . . . . . . . . . .278
Removal. . . . . . . . . . . . . . . . ...278
Installation. . . . . . . . . . . . . . . . 279

ON-VEHICLE SERVICE . . . . . . . . . . . ..280

Control Valve Assembly and Accumulators. . . .280
Control Cable Adjustment. . . . . . . . . . 281
Park/Neutral Position (PNP) Switch Adjustment . .281
Differential Side Oil Seal Replacement . . . . ...282
Revolution Sensor Replacement . . . . . . . .282

REMOVAL AND INSTALLATION . . . . . . . ...283

Removal. . . . . . . . . . . . . . . . ...283
Installation. . . . . . . . . . . . . . . . 284

OVERHAUL . . . . . . . . . . . . . . . . .286

Components. . . . . . . . . . . . . . . .286
Oil Channel . . . . . . . . . . . . . . . ..289
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings . . . . . . . 290

DISASSEMBLY. . . . . . . . . . . . . . . 291
REPAIR FOR COMPONENT PARTS . . . . . . .305

Manual Shaft. . . . . . . . . . . . . . . 305
Oil Pump . . . . . . . . . . . . . . . . ..308
Control Valve Assembly. . . . . . . . . . ...312
Control Valve Upper Body . . . . . . . . . ...321
Control Valve Lower Body . . . . . . . . . ...325
Reverse Clutch . . . . . . . . . . . . . . 327
High Clutch . . . . . . . . . . . . . . . ..331
Forward Clutch and Overrun Clutch. . . . . . 336
Low & Reverse Brake. . . . . . . . . . . ..343
Rear Internal Gear, Forward Clutch Hub and
Overrun Clutch Hub. . . . . . . . . . . . .347
Output Shaft, Idler Gear, Reduction Pinion Gear
and Bearing Retainer. . . . . . . . . . . ...351
Band Servo Piston Assembly . . . . . . . . ..356

Final Drive. . . . . . . . . . . . . . . . 361

ASSEMBLY. . . . . . . . . . . . . . . . ..368

Assembly (1). . . . . . . . . . . . . . . 368
Adjustment (1) . . . . . . . . . . . . . . .369
Assembly (2). . . . . . . . . . . . . . . 374
Adjustment (2) . . . . . . . . . . . . . . .378
Assembly (3). . . . . . . . . . . . . . . 382
Assembly (4). . . . . . . . . . . . . . . 384

SERVICE DATA AND SPECIFICATIONS (SDS) . ...389

General Specifications. . . . . . . . . . . .389
Shift Schedule. . . . . . . . . . . . . . ..389
Stall Revolution. . . . . . . . . . . . . . 389
Line Pressure. . . . . . . . . . . . . . ...389
Control Valves. . . . . . . . . . . . . . ..390
Clutch and Brakes . . . . . . . . . . . . ...390
Clutch and Brake Return Springs. . . . . . . 392
Oil Pump . . . . . . . . . . . . . . . . ..392
Input Shaft . . . . . . . . . . . . . . . ...393
Planetary Carrier. . . . . . . . . . . . . ..393
Final Drive. . . . . . . . . . . . . . . . 393
Reduction Pinion Gear . . . . . . . . . . . 396
Output Shaft. . . . . . . . . . . . . . . .398
Bearing Retainer. . . . . . . . . . . . . ..398
Total End Play. . . . . . . . . . . . . . ..399
Reverse Clutch End Play . . . . . . . . . . 399
Accumulator . . . . . . . . . . . . . . . .399
Band Servo . . . . . . . . . . . . . . . ..399
Removal and Installation . . . . . . . . . . .400
Shift Solenoid Valves. . . . . . . . . . . ...400
Solenoid Valves . . . . . . . . . . . . . ...400
A/T Fluid Temperature Sensor. . . . . . . . .400
Revolution Sensor . . . . . . . . . . . . ...400
Dropping Resistor . . . . . . . . . . . . . 400

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CONTENTS

(Cont’d)

AT-3

Alphabetical & P No. Index for DTC

NCAT0001

ALPHABETICAL INDEX FOR DTC

NCAT0001S01

Items

(CONSULT-II screen terms)

DTC

Reference page

CONSULT-II

GST*1

A/T 1ST GR FNCTN

P0731

AT-128

A/T 2ND GR FNCTN

P0732

AT-135

A/T 3RD GR FNCTN

P0733

AT-141

A/T 4TH GR FNCTN

P0734

AT-147

A/T TCC S/V FNCTN

P0744

AT-163

ATF TEMP SEN/CIRC

P0710

AT-113

ENGINE SPEED SIG

P0725

AT-124

L/PRESS SOL/CIRC

P0745

AT-174

O/R CLTCH SOL/CIRC

P1760

AT-202

PNP SW/CIRC

P0705

AT-107

SFT SOL A/CIRC*2

P0750

AT-181

SFT SOL B/CIRC*2

P0755

AT-187

TCC SOLENOID/CIRC

P0740

AT-157

TP SEN/CIRC A/T*2

P1705

AT-193

VEH SPD SEN/CIR AT*3

P0720

AT-119

*1: These numbers are prescribed by SAE J2012.
*2: When the fail-safe operation occurs, the MIL illuminates.
*3: The MIL illuminates when both the “Revolution sensor signal” and the “Vehicle speed sensor signal” meet the fail-safe condition at
the same time.

TROUBLE DIAGNOSIS — INDEX

Alphabetical & P No. Index for DTC

AT-4